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Finding the Fourth Proportional to 718,477.76, 991,492.04 and 391,789.95

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Solution

The fourth proportional to 718,477.76, 991,492.04 and 391,789.95 is: 540,666.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,477.76 : 991,492.04 = 391,789.95 : x
  2. Step 2: Convert to fraction form
    718,477.76/991,492.04 = 391,789.95/x
  3. Step 3: Cross multiply
    718,477.76x = 991,492.04 × 391,789.95
  4. Step 4: Simplify right side
    718,477.76x = 388,456,614,038.38
  5. Step 5: Solve for x
    x = 388,456,614,038.38/718,477.76
  6. Step 6: Final answer
    x = 540,666.16

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1.5x scale

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.