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Finding the Fourth Proportional to 1,574.90, 2,359.20 and 988.10

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Solution

The fourth proportional to 1,574.90, 2,359.20 and 988.10 is: 1,480.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.90 : 2,359.20 = 988.10 : x
  2. Step 2: Convert to fraction form
    1,574.90/2,359.20 = 988.10/x
  3. Step 3: Cross multiply
    1,574.90x = 2,359.20 × 988.10
  4. Step 4: Simplify right side
    1,574.90x = 2,331,125.52
  5. Step 5: Solve for x
    x = 2,331,125.52/1,574.90
  6. Step 6: Final answer
    x = 1,480.17

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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.