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Finding the Fourth Proportional to 642,504.80, 963,757.20 and 455,880.80

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Solution

The fourth proportional to 642,504.80, 963,757.20 and 455,880.80 is: 683,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,504.80 : 963,757.20 = 455,880.80 : x
  2. Step 2: Convert to fraction form
    642,504.80/963,757.20 = 455,880.80/x
  3. Step 3: Cross multiply
    642,504.80x = 963,757.20 × 455,880.80
  4. Step 4: Simplify right side
    642,504.80x = 439,358,403,341.76
  5. Step 5: Solve for x
    x = 439,358,403,341.76/642,504.80
  6. Step 6: Final answer
    x = 683,821.20

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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.