Home / 21,000.48-28,970.43-13,440.75

Finding the Fourth Proportional to 21,000.48, 28,970.43 and 13,440.75

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Solution

The fourth proportional to 21,000.48, 28,970.43 and 13,440.75 is: 18,541.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.48 : 28,970.43 = 13,440.75 : x
  2. Step 2: Convert to fraction form
    21,000.48/28,970.43 = 13,440.75/x
  3. Step 3: Cross multiply
    21,000.48x = 28,970.43 × 13,440.75
  4. Step 4: Simplify right side
    21,000.48x = 389,384,307.02
  5. Step 5: Solve for x
    x = 389,384,307.02/21,000.48
  6. Step 6: Final answer
    x = 18,541.69

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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.