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Finding the Fourth Proportional to 770.90, 1,064.48 and 631.58

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Solution

The fourth proportional to 770.90, 1,064.48 and 631.58 is: 872.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.90 : 1,064.48 = 631.58 : x
  2. Step 2: Convert to fraction form
    770.90/1,064.48 = 631.58/x
  3. Step 3: Cross multiply
    770.90x = 1,064.48 × 631.58
  4. Step 4: Simplify right side
    770.90x = 672,295.80
  5. Step 5: Solve for x
    x = 672,295.80/770.90
  6. Step 6: Final answer
    x = 872.10

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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.