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Finding the Fourth Proportional to 720,818.95, 994,712.64 and 398,520.76

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Solution

The fourth proportional to 720,818.95, 994,712.64 and 398,520.76 is: 549,948.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,818.95 : 994,712.64 = 398,520.76 : x
  2. Step 2: Convert to fraction form
    720,818.95/994,712.64 = 398,520.76/x
  3. Step 3: Cross multiply
    720,818.95x = 994,712.64 × 398,520.76
  4. Step 4: Simplify right side
    720,818.95x = 396,413,637,274.41
  5. Step 5: Solve for x
    x = 396,413,637,274.41/720,818.95
  6. Step 6: Final answer
    x = 549,948.97

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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.