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Finding the Fourth Proportional to 280,611.45, 387,237.51 and 153,287.55

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Solution

The fourth proportional to 280,611.45, 387,237.51 and 153,287.55 is: 211,533.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,611.45 : 387,237.51 = 153,287.55 : x
  2. Step 2: Convert to fraction form
    280,611.45/387,237.51 = 153,287.55/x
  3. Step 3: Cross multiply
    280,611.45x = 387,237.51 × 153,287.55
  4. Step 4: Simplify right side
    280,611.45x = 59,358,689,176.00
  5. Step 5: Solve for x
    x = 59,358,689,176.00/280,611.45
  6. Step 6: Final answer
    x = 211,533.38

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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.