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Finding the Fourth Proportional to 715.66, 1,068.62 and 612.78

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Solution

The fourth proportional to 715.66, 1,068.62 and 612.78 is: 915.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.66 : 1,068.62 = 612.78 : x
  2. Step 2: Convert to fraction form
    715.66/1,068.62 = 612.78/x
  3. Step 3: Cross multiply
    715.66x = 1,068.62 × 612.78
  4. Step 4: Simplify right side
    715.66x = 654,828.96
  5. Step 5: Solve for x
    x = 654,828.96/715.66
  6. Step 6: Final answer
    x = 915.00

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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.