Home / 103,625.40-155,438.10-78,742.20

Finding the Fourth Proportional to 103,625.40, 155,438.10 and 78,742.20

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Solution

The fourth proportional to 103,625.40, 155,438.10 and 78,742.20 is: 118,113.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,625.40 : 155,438.10 = 78,742.20 : x
  2. Step 2: Convert to fraction form
    103,625.40/155,438.10 = 78,742.20/x
  3. Step 3: Cross multiply
    103,625.40x = 155,438.10 × 78,742.20
  4. Step 4: Simplify right side
    103,625.40x = 12,239,537,957.82
  5. Step 5: Solve for x
    x = 12,239,537,957.82/103,625.40
  6. Step 6: Final answer
    x = 118,113.30

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1.5x scale

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.