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Finding the Fourth Proportional to 280,718.53, 387,392.55 and 153,394.12

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Solution

The fourth proportional to 280,718.53, 387,392.55 and 153,394.12 is: 211,684.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,718.53 : 387,392.55 = 153,394.12 : x
  2. Step 2: Convert to fraction form
    280,718.53/387,392.55 = 153,394.12/x
  3. Step 3: Cross multiply
    280,718.53x = 387,392.55 × 153,394.12
  4. Step 4: Simplify right side
    280,718.53x = 59,423,739,301.81
  5. Step 5: Solve for x
    x = 59,423,739,301.81/280,718.53
  6. Step 6: Final answer
    x = 211,684.42

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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.