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Finding the Fourth Proportional to 661,186.48, 991,700.88 and 391,475.92

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Solution

The fourth proportional to 661,186.48, 991,700.88 and 391,475.92 is: 587,167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,186.48 : 991,700.88 = 391,475.92 : x
  2. Step 2: Convert to fraction form
    661,186.48/991,700.88 = 391,475.92/x
  3. Step 3: Cross multiply
    661,186.48x = 991,700.88 × 391,475.92
  4. Step 4: Simplify right side
    661,186.48x = 388,227,014,362.81
  5. Step 5: Solve for x
    x = 388,227,014,362.81/661,186.48
  6. Step 6: Final answer
    x = 587,167.20

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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.