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Finding the Fourth Proportional to 770.98, 1,064.30 and 491.59

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Solution

The fourth proportional to 770.98, 1,064.30 and 491.59 is: 678.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.98 : 1,064.30 = 491.59 : x
  2. Step 2: Convert to fraction form
    770.98/1,064.30 = 491.59/x
  3. Step 3: Cross multiply
    770.98x = 1,064.30 × 491.59
  4. Step 4: Simplify right side
    770.98x = 523,199.24
  5. Step 5: Solve for x
    x = 523,199.24/770.98
  6. Step 6: Final answer
    x = 678.62

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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.