Home / 103,638.70-155,458.05-81,088.30

Finding the Fourth Proportional to 103,638.70, 155,458.05 and 81,088.30

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Solution

The fourth proportional to 103,638.70, 155,458.05 and 81,088.30 is: 121,632.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.70 : 155,458.05 = 81,088.30 : x
  2. Step 2: Convert to fraction form
    103,638.70/155,458.05 = 81,088.30/x
  3. Step 3: Cross multiply
    103,638.70x = 155,458.05 × 81,088.30
  4. Step 4: Simplify right side
    103,638.70x = 12,605,828,995.82
  5. Step 5: Solve for x
    x = 12,605,828,995.82/103,638.70
  6. Step 6: Final answer
    x = 121,632.45

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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.