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Finding the Fourth Proportional to 1,162.70, 1,746.48 and 980.45

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Solution

The fourth proportional to 1,162.70, 1,746.48 and 980.45 is: 1,472.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.70 : 1,746.48 = 980.45 : x
  2. Step 2: Convert to fraction form
    1,162.70/1,746.48 = 980.45/x
  3. Step 3: Cross multiply
    1,162.70x = 1,746.48 × 980.45
  4. Step 4: Simplify right side
    1,162.70x = 1,712,336.32
  5. Step 5: Solve for x
    x = 1,712,336.32/1,162.70
  6. Step 6: Final answer
    x = 1,472.72

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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.