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Finding the Fourth Proportional to 770.16, 1,063.08 and 647.04

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Solution

The fourth proportional to 770.16, 1,063.08 and 647.04 is: 893.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.16 : 1,063.08 = 647.04 : x
  2. Step 2: Convert to fraction form
    770.16/1,063.08 = 647.04/x
  3. Step 3: Cross multiply
    770.16x = 1,063.08 × 647.04
  4. Step 4: Simplify right side
    770.16x = 687,855.28
  5. Step 5: Solve for x
    x = 687,855.28/770.16
  6. Step 6: Final answer
    x = 893.13

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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.