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Finding the Fourth Proportional to 278,779.97, 384,718.20 and 151,455.53

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Solution

The fourth proportional to 278,779.97, 384,718.20 and 151,455.53 is: 209,009.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,779.97 : 384,718.20 = 151,455.53 : x
  2. Step 2: Convert to fraction form
    278,779.97/384,718.20 = 151,455.53/x
  3. Step 3: Cross multiply
    278,779.97x = 384,718.20 × 151,455.53
  4. Step 4: Simplify right side
    278,779.97x = 58,267,698,881.65
  5. Step 5: Solve for x
    x = 58,267,698,881.65/278,779.97
  6. Step 6: Final answer
    x = 209,009.63

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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.