Home / 135,705.09-187,281.51-78,354.91

Finding the Fourth Proportional to 135,705.09, 187,281.51 and 78,354.91

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Solution

The fourth proportional to 135,705.09, 187,281.51 and 78,354.91 is: 108,134.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,705.09 : 187,281.51 = 78,354.91 : x
  2. Step 2: Convert to fraction form
    135,705.09/187,281.51 = 78,354.91/x
  3. Step 3: Cross multiply
    135,705.09x = 187,281.51 × 78,354.91
  4. Step 4: Simplify right side
    135,705.09x = 14,674,425,860.71
  5. Step 5: Solve for x
    x = 14,674,425,860.71/135,705.09
  6. Step 6: Final answer
    x = 108,134.68

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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.