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Finding the Fourth Proportional to 1,006.75, 1,510.71 and 421.66

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Solution

The fourth proportional to 1,006.75, 1,510.71 and 421.66 is: 632.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.75 : 1,510.71 = 421.66 : x
  2. Step 2: Convert to fraction form
    1,006.75/1,510.71 = 421.66/x
  3. Step 3: Cross multiply
    1,006.75x = 1,510.71 × 421.66
  4. Step 4: Simplify right side
    1,006.75x = 637,005.98
  5. Step 5: Solve for x
    x = 637,005.98/1,006.75
  6. Step 6: Final answer
    x = 632.74

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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.