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Finding the Fourth Proportional to 15,038.50, 20,739.35 and 12,913.31

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Solution

The fourth proportional to 15,038.50, 20,739.35 and 12,913.31 is: 17,808.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,038.50 : 20,739.35 = 12,913.31 : x
  2. Step 2: Convert to fraction form
    15,038.50/20,739.35 = 12,913.31/x
  3. Step 3: Cross multiply
    15,038.50x = 20,739.35 × 12,913.31
  4. Step 4: Simplify right side
    15,038.50x = 267,813,591.18
  5. Step 5: Solve for x
    x = 267,813,591.18/15,038.50
  6. Step 6: Final answer
    x = 17,808.53

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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.