Home / 21,000.26-28,970.16-13,440.53

Finding the Fourth Proportional to 21,000.26, 28,970.16 and 13,440.53

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Solution

The fourth proportional to 21,000.26, 28,970.16 and 13,440.53 is: 18,541.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.26 : 28,970.16 = 13,440.53 : x
  2. Step 2: Convert to fraction form
    21,000.26/28,970.16 = 13,440.53/x
  3. Step 3: Cross multiply
    21,000.26x = 28,970.16 × 13,440.53
  4. Step 4: Simplify right side
    21,000.26x = 389,374,326.61
  5. Step 5: Solve for x
    x = 389,374,326.61/21,000.26
  6. Step 6: Final answer
    x = 18,541.40

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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.