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Finding the Fourth Proportional to 647,485.40, 971,228.10 and 490,021.40

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Solution

The fourth proportional to 647,485.40, 971,228.10 and 490,021.40 is: 735,032.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,485.40 : 971,228.10 = 490,021.40 : x
  2. Step 2: Convert to fraction form
    647,485.40/971,228.10 = 490,021.40/x
  3. Step 3: Cross multiply
    647,485.40x = 971,228.10 × 490,021.40
  4. Step 4: Simplify right side
    647,485.40x = 475,922,553,281.34
  5. Step 5: Solve for x
    x = 475,922,553,281.34/647,485.40
  6. Step 6: Final answer
    x = 735,032.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.