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Finding the Fourth Proportional to 752.83, 1,038.90 and 690.91

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Solution

The fourth proportional to 752.83, 1,038.90 and 690.91 is: 953.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.83 : 1,038.90 = 690.91 : x
  2. Step 2: Convert to fraction form
    752.83/1,038.90 = 690.91/x
  3. Step 3: Cross multiply
    752.83x = 1,038.90 × 690.91
  4. Step 4: Simplify right side
    752.83x = 717,786.40
  5. Step 5: Solve for x
    x = 717,786.40/752.83
  6. Step 6: Final answer
    x = 953.45

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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.