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Finding the Fourth Proportional to 545.64, 753 and 312.72

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Solution

The fourth proportional to 545.64, 753 and 312.72 is: 431.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.64 : 753 = 312.72 : x
  2. Step 2: Convert to fraction form
    545.64/753 = 312.72/x
  3. Step 3: Cross multiply
    545.64x = 753 × 312.72
  4. Step 4: Simplify right side
    545.64x = 235,478.16
  5. Step 5: Solve for x
    x = 235,478.16/545.64
  6. Step 6: Final answer
    x = 431.56

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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.