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Finding the Fourth Proportional to 290,091.39, 435,140.09 and 87,689.18

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Solution

The fourth proportional to 290,091.39, 435,140.09 and 87,689.18 is: 131,534.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,091.39 : 435,140.09 = 87,689.18 : x
  2. Step 2: Convert to fraction form
    290,091.39/435,140.09 = 87,689.18/x
  3. Step 3: Cross multiply
    290,091.39x = 435,140.09 × 87,689.18
  4. Step 4: Simplify right side
    290,091.39x = 38,157,075,063.08
  5. Step 5: Solve for x
    x = 38,157,075,063.08/290,091.39
  6. Step 6: Final answer
    x = 131,534.67

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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.