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Finding the Fourth Proportional to 760.15, 1,139.21 and 348.87

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Solution

The fourth proportional to 760.15, 1,139.21 and 348.87 is: 522.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.15 : 1,139.21 = 348.87 : x
  2. Step 2: Convert to fraction form
    760.15/1,139.21 = 348.87/x
  3. Step 3: Cross multiply
    760.15x = 1,139.21 × 348.87
  4. Step 4: Simplify right side
    760.15x = 397,436.19
  5. Step 5: Solve for x
    x = 397,436.19/760.15
  6. Step 6: Final answer
    x = 522.84

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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.