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Finding the Fourth Proportional to 56,009.60, 84,004.80 and 20,931.20

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Solution

The fourth proportional to 56,009.60, 84,004.80 and 20,931.20 is: 31,393.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,009.60 : 84,004.80 = 20,931.20 : x
  2. Step 2: Convert to fraction form
    56,009.60/84,004.80 = 20,931.20/x
  3. Step 3: Cross multiply
    56,009.60x = 84,004.80 × 20,931.20
  4. Step 4: Simplify right side
    56,009.60x = 1,758,321,269.76
  5. Step 5: Solve for x
    x = 1,758,321,269.76/56,009.60
  6. Step 6: Final answer
    x = 31,393.21

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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.