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Finding the Fourth Proportional to 720,678.12, 994,483.62 and 398,394

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Solution

The fourth proportional to 720,678.12, 994,483.62 and 398,394 is: 549,754.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,678.12 : 994,483.62 = 398,394 : x
  2. Step 2: Convert to fraction form
    720,678.12/994,483.62 = 398,394/x
  3. Step 3: Cross multiply
    720,678.12x = 994,483.62 × 398,394
  4. Step 4: Simplify right side
    720,678.12x = 396,196,307,306.28
  5. Step 5: Solve for x
    x = 396,196,307,306.28/720,678.12
  6. Step 6: Final answer
    x = 549,754.87

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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.