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Finding the Fourth Proportional to 487,191.68, 671,990.92 and 317,655.44

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Solution

The fourth proportional to 487,191.68, 671,990.92 and 317,655.44 is: 438,147.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,191.68 : 671,990.92 = 317,655.44 : x
  2. Step 2: Convert to fraction form
    487,191.68/671,990.92 = 317,655.44/x
  3. Step 3: Cross multiply
    487,191.68x = 671,990.92 × 317,655.44
  4. Step 4: Simplify right side
    487,191.68x = 213,461,571,368.61
  5. Step 5: Solve for x
    x = 213,461,571,368.61/487,191.68
  6. Step 6: Final answer
    x = 438,147.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.