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Finding the Fourth Proportional to 715,561.40, 987,492.84 and 393,279.68

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Solution

The fourth proportional to 715,561.40, 987,492.84 and 393,279.68 is: 542,735.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,561.40 : 987,492.84 = 393,279.68 : x
  2. Step 2: Convert to fraction form
    715,561.40/987,492.84 = 393,279.68/x
  3. Step 3: Cross multiply
    715,561.40x = 987,492.84 × 393,279.68
  4. Step 4: Simplify right side
    715,561.40x = 388,360,868,117.49
  5. Step 5: Solve for x
    x = 388,360,868,117.49/715,561.40
  6. Step 6: Final answer
    x = 542,735.91

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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.