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Finding the Fourth Proportional to 860,696.64, 1,187,744.32 and 478,715.20

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Solution

The fourth proportional to 860,696.64, 1,187,744.32 and 478,715.20 is: 660,617.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,696.64 : 1,187,744.32 = 478,715.20 : x
  2. Step 2: Convert to fraction form
    860,696.64/1,187,744.32 = 478,715.20/x
  3. Step 3: Cross multiply
    860,696.64x = 1,187,744.32 × 478,715.20
  4. Step 4: Simplify right side
    860,696.64x = 568,591,259,697.66
  5. Step 5: Solve for x
    x = 568,591,259,697.66/860,696.64
  6. Step 6: Final answer
    x = 660,617.50

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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.