Home / 90,210.12-135,312.41-42,859.28

Finding the Fourth Proportional to 90,210.12, 135,312.41 and 42,859.28

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Solution

The fourth proportional to 90,210.12, 135,312.41 and 42,859.28 is: 64,287.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,210.12 : 135,312.41 = 42,859.28 : x
  2. Step 2: Convert to fraction form
    90,210.12/135,312.41 = 42,859.28/x
  3. Step 3: Cross multiply
    90,210.12x = 135,312.41 × 42,859.28
  4. Step 4: Simplify right side
    90,210.12x = 5,799,391,576.81
  5. Step 5: Solve for x
    x = 5,799,391,576.81/90,210.12
  6. Step 6: Final answer
    x = 64,287.59

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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.