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Finding the Fourth Proportional to 290,281.12, 435,437.88 and 90,629.08

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Solution

The fourth proportional to 290,281.12, 435,437.88 and 90,629.08 is: 135,948.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,281.12 : 435,437.88 = 90,629.08 : x
  2. Step 2: Convert to fraction form
    290,281.12/435,437.88 = 90,629.08/x
  3. Step 3: Cross multiply
    290,281.12x = 435,437.88 × 90,629.08
  4. Step 4: Simplify right side
    290,281.12x = 39,463,334,461.55
  5. Step 5: Solve for x
    x = 39,463,334,461.55/290,281.12
  6. Step 6: Final answer
    x = 135,948.68

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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.