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Finding the Fourth Proportional to 751.54, 1,127.10 and 318.40

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Solution

The fourth proportional to 751.54, 1,127.10 and 318.40 is: 477.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.54 : 1,127.10 = 318.40 : x
  2. Step 2: Convert to fraction form
    751.54/1,127.10 = 318.40/x
  3. Step 3: Cross multiply
    751.54x = 1,127.10 × 318.40
  4. Step 4: Simplify right side
    751.54x = 358,868.64
  5. Step 5: Solve for x
    x = 358,868.64/751.54
  6. Step 6: Final answer
    x = 477.51

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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.