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Finding the Fourth Proportional to 977.22, 1,457.52 and 915.66

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Solution

The fourth proportional to 977.22, 1,457.52 and 915.66 is: 1,365.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.22 : 1,457.52 = 915.66 : x
  2. Step 2: Convert to fraction form
    977.22/1,457.52 = 915.66/x
  3. Step 3: Cross multiply
    977.22x = 1,457.52 × 915.66
  4. Step 4: Simplify right side
    977.22x = 1,334,592.76
  5. Step 5: Solve for x
    x = 1,334,592.76/977.22
  6. Step 6: Final answer
    x = 1,365.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.