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Finding the Fourth Proportional to 55,812.80, 83,719.20 and 42,690.80

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Solution

The fourth proportional to 55,812.80, 83,719.20 and 42,690.80 is: 64,036.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,812.80 : 83,719.20 = 42,690.80 : x
  2. Step 2: Convert to fraction form
    55,812.80/83,719.20 = 42,690.80/x
  3. Step 3: Cross multiply
    55,812.80x = 83,719.20 × 42,690.80
  4. Step 4: Simplify right side
    55,812.80x = 3,574,039,623.36
  5. Step 5: Solve for x
    x = 3,574,039,623.36/55,812.80
  6. Step 6: Final answer
    x = 64,036.20

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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.