Home / 105,428.40-145,485-57,672.24

Finding the Fourth Proportional to 105,428.40, 145,485 and 57,672.24

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Solution

The fourth proportional to 105,428.40, 145,485 and 57,672.24 is: 79,584.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,428.40 : 145,485 = 57,672.24 : x
  2. Step 2: Convert to fraction form
    105,428.40/145,485 = 57,672.24/x
  3. Step 3: Cross multiply
    105,428.40x = 145,485 × 57,672.24
  4. Step 4: Simplify right side
    105,428.40x = 8,390,445,836.40
  5. Step 5: Solve for x
    x = 8,390,445,836.40/105,428.40
  6. Step 6: Final answer
    x = 79,584.30

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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.