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Finding the Fourth Proportional to 1,038.08, 1,432.79 and 706.64

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Solution

The fourth proportional to 1,038.08, 1,432.79 and 706.64 is: 975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.08 : 1,432.79 = 706.64 : x
  2. Step 2: Convert to fraction form
    1,038.08/1,432.79 = 706.64/x
  3. Step 3: Cross multiply
    1,038.08x = 1,432.79 × 706.64
  4. Step 4: Simplify right side
    1,038.08x = 1,012,466.74
  5. Step 5: Solve for x
    x = 1,012,466.74/1,038.08
  6. Step 6: Final answer
    x = 975.32

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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.