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Finding the Fourth Proportional to 987.15, 1,362.51 and 693.12

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Solution

The fourth proportional to 987.15, 1,362.51 and 693.12 is: 956.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.15 : 1,362.51 = 693.12 : x
  2. Step 2: Convert to fraction form
    987.15/1,362.51 = 693.12/x
  3. Step 3: Cross multiply
    987.15x = 1,362.51 × 693.12
  4. Step 4: Simplify right side
    987.15x = 944,382.93
  5. Step 5: Solve for x
    x = 944,382.93/987.15
  6. Step 6: Final answer
    x = 956.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.