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Finding the Fourth Proportional to 720,392.61, 994,063.98 and 398,058.87

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Solution

The fourth proportional to 720,392.61, 994,063.98 and 398,058.87 is: 549,278.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,392.61 : 994,063.98 = 398,058.87 : x
  2. Step 2: Convert to fraction form
    720,392.61/994,063.98 = 398,058.87/x
  3. Step 3: Cross multiply
    720,392.61x = 994,063.98 × 398,058.87
  4. Step 4: Simplify right side
    720,392.61x = 395,695,984,586.50
  5. Step 5: Solve for x
    x = 395,695,984,586.50/720,392.61
  6. Step 6: Final answer
    x = 549,278.24

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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.