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Finding the Fourth Proportional to 21,000.79, 31,490.26 and 9,904.50

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Solution

The fourth proportional to 21,000.79, 31,490.26 and 9,904.50 is: 14,851.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.79 : 31,490.26 = 9,904.50 : x
  2. Step 2: Convert to fraction form
    21,000.79/31,490.26 = 9,904.50/x
  3. Step 3: Cross multiply
    21,000.79x = 31,490.26 × 9,904.50
  4. Step 4: Simplify right side
    21,000.79x = 311,895,280.17
  5. Step 5: Solve for x
    x = 311,895,280.17/21,000.79
  6. Step 6: Final answer
    x = 14,851.60

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1.5x scale

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.