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Finding the Fourth Proportional to 90,678.80, 136,018.20 and 49,206.80

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Solution

The fourth proportional to 90,678.80, 136,018.20 and 49,206.80 is: 73,810.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,678.80 : 136,018.20 = 49,206.80 : x
  2. Step 2: Convert to fraction form
    90,678.80/136,018.20 = 49,206.80/x
  3. Step 3: Cross multiply
    90,678.80x = 136,018.20 × 49,206.80
  4. Step 4: Simplify right side
    90,678.80x = 6,693,020,363.76
  5. Step 5: Solve for x
    x = 6,693,020,363.76/90,678.80
  6. Step 6: Final answer
    x = 73,810.20

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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.