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Finding the Fourth Proportional to 1,318.71, 1,975.86 and 928.01

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Solution

The fourth proportional to 1,318.71, 1,975.86 and 928.01 is: 1,390.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.71 : 1,975.86 = 928.01 : x
  2. Step 2: Convert to fraction form
    1,318.71/1,975.86 = 928.01/x
  3. Step 3: Cross multiply
    1,318.71x = 1,975.86 × 928.01
  4. Step 4: Simplify right side
    1,318.71x = 1,833,612.90
  5. Step 5: Solve for x
    x = 1,833,612.90/1,318.71
  6. Step 6: Final answer
    x = 1,390.46

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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.