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Finding the Fourth Proportional to 1,070.16, 1,475.90 and 697

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Solution

The fourth proportional to 1,070.16, 1,475.90 and 697 is: 961.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.16 : 1,475.90 = 697 : x
  2. Step 2: Convert to fraction form
    1,070.16/1,475.90 = 697/x
  3. Step 3: Cross multiply
    1,070.16x = 1,475.90 × 697
  4. Step 4: Simplify right side
    1,070.16x = 1,028,702.30
  5. Step 5: Solve for x
    x = 1,028,702.30/1,070.16
  6. Step 6: Final answer
    x = 961.26

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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.