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Finding the Fourth Proportional to 1,439.90, 1,986.36 and 916.10

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Solution

The fourth proportional to 1,439.90, 1,986.36 and 916.10 is: 1,263.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.90 : 1,986.36 = 916.10 : x
  2. Step 2: Convert to fraction form
    1,439.90/1,986.36 = 916.10/x
  3. Step 3: Cross multiply
    1,439.90x = 1,986.36 × 916.10
  4. Step 4: Simplify right side
    1,439.90x = 1,819,704.40
  5. Step 5: Solve for x
    x = 1,819,704.40/1,439.90
  6. Step 6: Final answer
    x = 1,263.77

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1.5x scale

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.