Home / 66,621.64-91,929.01-42,780.61

Finding the Fourth Proportional to 66,621.64, 91,929.01 and 42,780.61

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Solution

The fourth proportional to 66,621.64, 91,929.01 and 42,780.61 is: 59,031.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,621.64 : 91,929.01 = 42,780.61 : x
  2. Step 2: Convert to fraction form
    66,621.64/91,929.01 = 42,780.61/x
  3. Step 3: Cross multiply
    66,621.64x = 91,929.01 × 42,780.61
  4. Step 4: Simplify right side
    66,621.64x = 3,932,779,124.50
  5. Step 5: Solve for x
    x = 3,932,779,124.50/66,621.64
  6. Step 6: Final answer
    x = 59,031.56

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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.