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Finding the Fourth Proportional to 135,509.79, 187,034.58 and 90,189.69

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Solution

The fourth proportional to 135,509.79, 187,034.58 and 90,189.69 is: 124,482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,509.79 : 187,034.58 = 90,189.69 : x
  2. Step 2: Convert to fraction form
    135,509.79/187,034.58 = 90,189.69/x
  3. Step 3: Cross multiply
    135,509.79x = 187,034.58 × 90,189.69
  4. Step 4: Simplify right side
    135,509.79x = 16,868,590,789.48
  5. Step 5: Solve for x
    x = 16,868,590,789.48/135,509.79
  6. Step 6: Final answer
    x = 124,482.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.