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Finding the Fourth Proportional to 770.16, 1,152.80 and 653.52

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Solution

The fourth proportional to 770.16, 1,152.80 and 653.52 is: 978.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.16 : 1,152.80 = 653.52 : x
  2. Step 2: Convert to fraction form
    770.16/1,152.80 = 653.52/x
  3. Step 3: Cross multiply
    770.16x = 1,152.80 × 653.52
  4. Step 4: Simplify right side
    770.16x = 753,377.86
  5. Step 5: Solve for x
    x = 753,377.86/770.16
  6. Step 6: Final answer
    x = 978.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.