Home / 81,440.64-112,387-45,631.35

Finding the Fourth Proportional to 81,440.64, 112,387 and 45,631.35

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Solution

The fourth proportional to 81,440.64, 112,387 and 45,631.35 is: 62,970.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,440.64 : 112,387 = 45,631.35 : x
  2. Step 2: Convert to fraction form
    81,440.64/112,387 = 45,631.35/x
  3. Step 3: Cross multiply
    81,440.64x = 112,387 × 45,631.35
  4. Step 4: Simplify right side
    81,440.64x = 5,128,370,813.42
  5. Step 5: Solve for x
    x = 5,128,370,813.42/81,440.64
  6. Step 6: Final answer
    x = 62,970.66

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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.