Home / 90,300.20-135,320.70-66,421.40

Finding the Fourth Proportional to 90,300.20, 135,320.70 and 66,421.40

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Solution

The fourth proportional to 90,300.20, 135,320.70 and 66,421.40 is: 99,536.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,300.20 : 135,320.70 = 66,421.40 : x
  2. Step 2: Convert to fraction form
    90,300.20/135,320.70 = 66,421.40/x
  3. Step 3: Cross multiply
    90,300.20x = 135,320.70 × 66,421.40
  4. Step 4: Simplify right side
    90,300.20x = 8,988,190,342.98
  5. Step 5: Solve for x
    x = 8,988,190,342.98/90,300.20
  6. Step 6: Final answer
    x = 99,536.77

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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.