Home / 28,663.10-42,909.60-21,300.20

Finding the Fourth Proportional to 28,663.10, 42,909.60 and 21,300.20

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Solution

The fourth proportional to 28,663.10, 42,909.60 and 21,300.20 is: 31,887.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,663.10 : 42,909.60 = 21,300.20 : x
  2. Step 2: Convert to fraction form
    28,663.10/42,909.60 = 21,300.20/x
  3. Step 3: Cross multiply
    28,663.10x = 42,909.60 × 21,300.20
  4. Step 4: Simplify right side
    28,663.10x = 913,983,061.92
  5. Step 5: Solve for x
    x = 913,983,061.92/28,663.10
  6. Step 6: Final answer
    x = 31,887.10

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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.