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Finding the Fourth Proportional to 55,681.60, 76,840.80 and 30,531.20

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Solution

The fourth proportional to 55,681.60, 76,840.80 and 30,531.20 is: 42,133.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,681.60 : 76,840.80 = 30,531.20 : x
  2. Step 2: Convert to fraction form
    55,681.60/76,840.80 = 30,531.20/x
  3. Step 3: Cross multiply
    55,681.60x = 76,840.80 × 30,531.20
  4. Step 4: Simplify right side
    55,681.60x = 2,346,041,832.96
  5. Step 5: Solve for x
    x = 2,346,041,832.96/55,681.60
  6. Step 6: Final answer
    x = 42,133.16

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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.