Home / 428,925.06-643,390.02-113,378.63

Finding the Fourth Proportional to 428,925.06, 643,390.02 and 113,378.63

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Solution

The fourth proportional to 428,925.06, 643,390.02 and 113,378.63 is: 170,068.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,925.06 : 643,390.02 = 113,378.63 : x
  2. Step 2: Convert to fraction form
    428,925.06/643,390.02 = 113,378.63/x
  3. Step 3: Cross multiply
    428,925.06x = 643,390.02 × 113,378.63
  4. Step 4: Simplify right side
    428,925.06x = 72,946,679,023.27
  5. Step 5: Solve for x
    x = 72,946,679,023.27/428,925.06
  6. Step 6: Final answer
    x = 170,068.59

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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.