Home / 280,478.07-387,059.70-153,153.78

Finding the Fourth Proportional to 280,478.07, 387,059.70 and 153,153.78

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Solution

The fourth proportional to 280,478.07, 387,059.70 and 153,153.78 is: 211,352.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,478.07 : 387,059.70 = 153,153.78 : x
  2. Step 2: Convert to fraction form
    280,478.07/387,059.70 = 153,153.78/x
  3. Step 3: Cross multiply
    280,478.07x = 387,059.70 × 153,153.78
  4. Step 4: Simplify right side
    280,478.07x = 59,279,656,140.67
  5. Step 5: Solve for x
    x = 59,279,656,140.67/280,478.07
  6. Step 6: Final answer
    x = 211,352.20

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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.