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Finding the Fourth Proportional to 710.88, 1,058.75 and 665.88

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Solution

The fourth proportional to 710.88, 1,058.75 and 665.88 is: 991.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.88 : 1,058.75 = 665.88 : x
  2. Step 2: Convert to fraction form
    710.88/1,058.75 = 665.88/x
  3. Step 3: Cross multiply
    710.88x = 1,058.75 × 665.88
  4. Step 4: Simplify right side
    710.88x = 704,997.12
  5. Step 5: Solve for x
    x = 704,997.12/710.88
  6. Step 6: Final answer
    x = 991.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.