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Finding the Fourth Proportional to 21,784.80, 32,430.84 and 21,655.20

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Solution

The fourth proportional to 21,784.80, 32,430.84 and 21,655.20 is: 32,237.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,784.80 : 32,430.84 = 21,655.20 : x
  2. Step 2: Convert to fraction form
    21,784.80/32,430.84 = 21,655.20/x
  3. Step 3: Cross multiply
    21,784.80x = 32,430.84 × 21,655.20
  4. Step 4: Simplify right side
    21,784.80x = 702,296,326.37
  5. Step 5: Solve for x
    x = 702,296,326.37/21,784.80
  6. Step 6: Final answer
    x = 32,237.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.