Home / 717,890.30-990,675.84-391,206.15

Finding the Fourth Proportional to 717,890.30, 990,675.84 and 391,206.15

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Solution

The fourth proportional to 717,890.30, 990,675.84 and 391,206.15 is: 539,857.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,890.30 : 990,675.84 = 391,206.15 : x
  2. Step 2: Convert to fraction form
    717,890.30/990,675.84 = 391,206.15/x
  3. Step 3: Cross multiply
    717,890.30x = 990,675.84 × 391,206.15
  4. Step 4: Simplify right side
    717,890.30x = 387,558,481,264.42
  5. Step 5: Solve for x
    x = 387,558,481,264.42/717,890.30
  6. Step 6: Final answer
    x = 539,857.53

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Double scale
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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.