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Finding the Fourth Proportional to 1,007.18, 1,510.96 and 390.76

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Solution

The fourth proportional to 1,007.18, 1,510.96 and 390.76 is: 586.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.18 : 1,510.96 = 390.76 : x
  2. Step 2: Convert to fraction form
    1,007.18/1,510.96 = 390.76/x
  3. Step 3: Cross multiply
    1,007.18x = 1,510.96 × 390.76
  4. Step 4: Simplify right side
    1,007.18x = 590,422.73
  5. Step 5: Solve for x
    x = 590,422.73/1,007.18
  6. Step 6: Final answer
    x = 586.21

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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.