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Finding the Fourth Proportional to 718,248.99, 991,158.09 and 391,555.24

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Solution

The fourth proportional to 718,248.99, 991,158.09 and 391,555.24 is: 540,332.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,248.99 : 991,158.09 = 391,555.24 : x
  2. Step 2: Convert to fraction form
    718,248.99/991,158.09 = 391,555.24/x
  3. Step 3: Cross multiply
    718,248.99x = 991,158.09 × 391,555.24
  4. Step 4: Simplify right side
    718,248.99x = 388,093,139,861.66
  5. Step 5: Solve for x
    x = 388,093,139,861.66/718,248.99
  6. Step 6: Final answer
    x = 540,332.31

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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.