Home / 78,125.10-107,812.58-42,315.08

Finding the Fourth Proportional to 78,125.10, 107,812.58 and 42,315.08

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Solution

The fourth proportional to 78,125.10, 107,812.58 and 42,315.08 is: 58,394.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,125.10 : 107,812.58 = 42,315.08 : x
  2. Step 2: Convert to fraction form
    78,125.10/107,812.58 = 42,315.08/x
  3. Step 3: Cross multiply
    78,125.10x = 107,812.58 × 42,315.08
  4. Step 4: Simplify right side
    78,125.10x = 4,562,097,947.71
  5. Step 5: Solve for x
    x = 4,562,097,947.71/78,125.10
  6. Step 6: Final answer
    x = 58,394.78

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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.