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Finding the Fourth Proportional to 660,639.40, 990,959.10 and 187,340.20

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Solution

The fourth proportional to 660,639.40, 990,959.10 and 187,340.20 is: 281,010.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,639.40 : 990,959.10 = 187,340.20 : x
  2. Step 2: Convert to fraction form
    660,639.40/990,959.10 = 187,340.20/x
  3. Step 3: Cross multiply
    660,639.40x = 990,959.10 × 187,340.20
  4. Step 4: Simplify right side
    660,639.40x = 185,646,475,985.82
  5. Step 5: Solve for x
    x = 185,646,475,985.82/660,639.40
  6. Step 6: Final answer
    x = 281,010.30

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.