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Finding the Fourth Proportional to 647,543.70, 971,315.55 and 423,594.90

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Solution

The fourth proportional to 647,543.70, 971,315.55 and 423,594.90 is: 635,392.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,543.70 : 971,315.55 = 423,594.90 : x
  2. Step 2: Convert to fraction form
    647,543.70/971,315.55 = 423,594.90/x
  3. Step 3: Cross multiply
    647,543.70x = 971,315.55 × 423,594.90
  4. Step 4: Simplify right side
    647,543.70x = 411,444,313,270.70
  5. Step 5: Solve for x
    x = 411,444,313,270.70/647,543.70
  6. Step 6: Final answer
    x = 635,392.35

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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.