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Finding the Fourth Proportional to 280,668.56, 387,308.52 and 153,320.72

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Solution

The fourth proportional to 280,668.56, 387,308.52 and 153,320.72 is: 211,574.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,668.56 : 387,308.52 = 153,320.72 : x
  2. Step 2: Convert to fraction form
    280,668.56/387,308.52 = 153,320.72/x
  3. Step 3: Cross multiply
    280,668.56x = 387,308.52 × 153,320.72
  4. Step 4: Simplify right side
    280,668.56x = 59,382,421,148.53
  5. Step 5: Solve for x
    x = 59,382,421,148.53/280,668.56
  6. Step 6: Final answer
    x = 211,574.90

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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.