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Finding the Fourth Proportional to 280,242.65, 420,430.68 and 90,703.04

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Solution

The fourth proportional to 280,242.65, 420,430.68 and 90,703.04 is: 136,076.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,242.65 : 420,430.68 = 90,703.04 : x
  2. Step 2: Convert to fraction form
    280,242.65/420,430.68 = 90,703.04/x
  3. Step 3: Cross multiply
    280,242.65x = 420,430.68 × 90,703.04
  4. Step 4: Simplify right side
    280,242.65x = 38,134,338,683.11
  5. Step 5: Solve for x
    x = 38,134,338,683.11/280,242.65
  6. Step 6: Final answer
    x = 136,076.14

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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.