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Finding the Fourth Proportional to 561.44, 840.16 and 542.40

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Solution

The fourth proportional to 561.44, 840.16 and 542.40 is: 811.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.44 : 840.16 = 542.40 : x
  2. Step 2: Convert to fraction form
    561.44/840.16 = 542.40/x
  3. Step 3: Cross multiply
    561.44x = 840.16 × 542.40
  4. Step 4: Simplify right side
    561.44x = 455,702.78
  5. Step 5: Solve for x
    x = 455,702.78/561.44
  6. Step 6: Final answer
    x = 811.67

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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.