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Finding the Fourth Proportional to 1,316.65, 1,973.34 and 731.15

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Solution

The fourth proportional to 1,316.65, 1,973.34 and 731.15 is: 1,095.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.65 : 1,973.34 = 731.15 : x
  2. Step 2: Convert to fraction form
    1,316.65/1,973.34 = 731.15/x
  3. Step 3: Cross multiply
    1,316.65x = 1,973.34 × 731.15
  4. Step 4: Simplify right side
    1,316.65x = 1,442,807.54
  5. Step 5: Solve for x
    x = 1,442,807.54/1,316.65
  6. Step 6: Final answer
    x = 1,095.82

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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.