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Finding the Fourth Proportional to 1,155,631.20, 1,731,373.20 and 989,743.20

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Solution

The fourth proportional to 1,155,631.20, 1,731,373.20 and 989,743.20 is: 1,482,838.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155,631.20 : 1,731,373.20 = 989,743.20 : x
  2. Step 2: Convert to fraction form
    1,155,631.20/1,731,373.20 = 989,743.20/x
  3. Step 3: Cross multiply
    1,155,631.20x = 1,731,373.20 × 989,743.20
  4. Step 4: Simplify right side
    1,155,631.20x = 1,713,614,851,362.24
  5. Step 5: Solve for x
    x = 1,713,614,851,362.24/1,155,631.20
  6. Step 6: Final answer
    x = 1,482,838.86

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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.