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Finding the Fourth Proportional to 2,915.90, 4,368.02 and 1,989.16

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Solution

The fourth proportional to 2,915.90, 4,368.02 and 1,989.16 is: 2,979.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,915.90 : 4,368.02 = 1,989.16 : x
  2. Step 2: Convert to fraction form
    2,915.90/4,368.02 = 1,989.16/x
  3. Step 3: Cross multiply
    2,915.90x = 4,368.02 × 1,989.16
  4. Step 4: Simplify right side
    2,915.90x = 8,688,690.66
  5. Step 5: Solve for x
    x = 8,688,690.66/2,915.90
  6. Step 6: Final answer
    x = 2,979.76

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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.