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Finding the Fourth Proportional to 1,038.18, 1,432.79 and 775.74

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Solution

The fourth proportional to 1,038.18, 1,432.79 and 775.74 is: 1,070.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.18 : 1,432.79 = 775.74 : x
  2. Step 2: Convert to fraction form
    1,038.18/1,432.79 = 775.74/x
  3. Step 3: Cross multiply
    1,038.18x = 1,432.79 × 775.74
  4. Step 4: Simplify right side
    1,038.18x = 1,111,481.28
  5. Step 5: Solve for x
    x = 1,111,481.28/1,038.18
  6. Step 6: Final answer
    x = 1,070.60

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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.