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Finding the Fourth Proportional to 661,869.40, 992,804.10 and 485,613.40

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Solution

The fourth proportional to 661,869.40, 992,804.10 and 485,613.40 is: 728,420.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,869.40 : 992,804.10 = 485,613.40 : x
  2. Step 2: Convert to fraction form
    661,869.40/992,804.10 = 485,613.40/x
  3. Step 3: Cross multiply
    661,869.40x = 992,804.10 × 485,613.40
  4. Step 4: Simplify right side
    661,869.40x = 482,118,974,534.94
  5. Step 5: Solve for x
    x = 482,118,974,534.94/661,869.40
  6. Step 6: Final answer
    x = 728,420.10

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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.