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Finding the Fourth Proportional to 824.76, 1,235.16 and 581.40

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Solution

The fourth proportional to 824.76, 1,235.16 and 581.40 is: 870.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.76 : 1,235.16 = 581.40 : x
  2. Step 2: Convert to fraction form
    824.76/1,235.16 = 581.40/x
  3. Step 3: Cross multiply
    824.76x = 1,235.16 × 581.40
  4. Step 4: Simplify right side
    824.76x = 718,122.02
  5. Step 5: Solve for x
    x = 718,122.02/824.76
  6. Step 6: Final answer
    x = 870.70

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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.