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Finding the Fourth Proportional to 390,725.80, 538,684.71 and 281,738.95

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Solution

The fourth proportional to 390,725.80, 538,684.71 and 281,738.95 is: 388,427.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,725.80 : 538,684.71 = 281,738.95 : x
  2. Step 2: Convert to fraction form
    390,725.80/538,684.71 = 281,738.95/x
  3. Step 3: Cross multiply
    390,725.80x = 538,684.71 × 281,738.95
  4. Step 4: Simplify right side
    390,725.80x = 151,768,464,576.46
  5. Step 5: Solve for x
    x = 151,768,464,576.46/390,725.80
  6. Step 6: Final answer
    x = 388,427.04

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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.