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Finding the Fourth Proportional to 860,612.11, 1,187,686.80 and 478,630.69

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Solution

The fourth proportional to 860,612.11, 1,187,686.80 and 478,630.69 is: 660,533.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,612.11 : 1,187,686.80 = 478,630.69 : x
  2. Step 2: Convert to fraction form
    860,612.11/1,187,686.80 = 478,630.69/x
  3. Step 3: Cross multiply
    860,612.11x = 1,187,686.80 × 478,630.69
  4. Step 4: Simplify right side
    860,612.11x = 568,463,349,618.68
  5. Step 5: Solve for x
    x = 568,463,349,618.68/860,612.11
  6. Step 6: Final answer
    x = 660,533.76

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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.