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Finding the Fourth Proportional to 1,557.13, 2,335.70 and 980.41

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Solution

The fourth proportional to 1,557.13, 2,335.70 and 980.41 is: 1,470.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.13 : 2,335.70 = 980.41 : x
  2. Step 2: Convert to fraction form
    1,557.13/2,335.70 = 980.41/x
  3. Step 3: Cross multiply
    1,557.13x = 2,335.70 × 980.41
  4. Step 4: Simplify right side
    1,557.13x = 2,289,943.64
  5. Step 5: Solve for x
    x = 2,289,943.64/1,557.13
  6. Step 6: Final answer
    x = 1,470.62

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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.