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Finding the Fourth Proportional to 717,830.80, 990,650.72 and 395,540.84

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Solution

The fourth proportional to 717,830.80, 990,650.72 and 395,540.84 is: 545,870.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,830.80 : 990,650.72 = 395,540.84 : x
  2. Step 2: Convert to fraction form
    717,830.80/990,650.72 = 395,540.84/x
  3. Step 3: Cross multiply
    717,830.80x = 990,650.72 × 395,540.84
  4. Step 4: Simplify right side
    717,830.80x = 391,842,815,957.70
  5. Step 5: Solve for x
    x = 391,842,815,957.70/717,830.80
  6. Step 6: Final answer
    x = 545,870.72

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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.