Home / 645,140.80-966,836.40-431,300.80

Finding the Fourth Proportional to 645,140.80, 966,836.40 and 431,300.80

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Solution

The fourth proportional to 645,140.80, 966,836.40 and 431,300.80 is: 646,366.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,140.80 : 966,836.40 = 431,300.80 : x
  2. Step 2: Convert to fraction form
    645,140.80/966,836.40 = 431,300.80/x
  3. Step 3: Cross multiply
    645,140.80x = 966,836.40 × 431,300.80
  4. Step 4: Simplify right side
    645,140.80x = 416,997,312,789.12
  5. Step 5: Solve for x
    x = 416,997,312,789.12/645,140.80
  6. Step 6: Final answer
    x = 646,366.36

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Double scale
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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.