Home / 103,721.40-155,582.10-78,838.20

Finding the Fourth Proportional to 103,721.40, 155,582.10 and 78,838.20

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Solution

The fourth proportional to 103,721.40, 155,582.10 and 78,838.20 is: 118,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,721.40 : 155,582.10 = 78,838.20 : x
  2. Step 2: Convert to fraction form
    103,721.40/155,582.10 = 78,838.20/x
  3. Step 3: Cross multiply
    103,721.40x = 155,582.10 × 78,838.20
  4. Step 4: Simplify right side
    103,721.40x = 12,265,812,716.22
  5. Step 5: Solve for x
    x = 12,265,812,716.22/103,721.40
  6. Step 6: Final answer
    x = 118,257.30

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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.