Home / 90,543.12-135,814.68-31,378.77

Finding the Fourth Proportional to 90,543.12, 135,814.68 and 31,378.77

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Solution

The fourth proportional to 90,543.12, 135,814.68 and 31,378.77 is: 47,068.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,543.12 : 135,814.68 = 31,378.77 : x
  2. Step 2: Convert to fraction form
    90,543.12/135,814.68 = 31,378.77/x
  3. Step 3: Cross multiply
    90,543.12x = 135,814.68 × 31,378.77
  4. Step 4: Simplify right side
    90,543.12x = 4,261,697,606.34
  5. Step 5: Solve for x
    x = 4,261,697,606.34/90,543.12
  6. Step 6: Final answer
    x = 47,068.16

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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.