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Finding the Fourth Proportional to 920.07, 1,269.62 and 521.76

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Solution

The fourth proportional to 920.07, 1,269.62 and 521.76 is: 719.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.07 : 1,269.62 = 521.76 : x
  2. Step 2: Convert to fraction form
    920.07/1,269.62 = 521.76/x
  3. Step 3: Cross multiply
    920.07x = 1,269.62 × 521.76
  4. Step 4: Simplify right side
    920.07x = 662,434.32
  5. Step 5: Solve for x
    x = 662,434.32/920.07
  6. Step 6: Final answer
    x = 719.98

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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.