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Finding the Fourth Proportional to 717,176.89, 989,706.45 and 390,493.77

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Solution

The fourth proportional to 717,176.89, 989,706.45 and 390,493.77 is: 538,882.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,176.89 : 989,706.45 = 390,493.77 : x
  2. Step 2: Convert to fraction form
    717,176.89/989,706.45 = 390,493.77/x
  3. Step 3: Cross multiply
    717,176.89x = 989,706.45 × 390,493.77
  4. Step 4: Simplify right side
    717,176.89x = 386,474,202,853.82
  5. Step 5: Solve for x
    x = 386,474,202,853.82/717,176.89
  6. Step 6: Final answer
    x = 538,882.68

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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.