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Finding the Fourth Proportional to 390,336.61, 538,456.74 and 237,421.57

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Solution

The fourth proportional to 390,336.61, 538,456.74 and 237,421.57 is: 327,515.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,336.61 : 538,456.74 = 237,421.57 : x
  2. Step 2: Convert to fraction form
    390,336.61/538,456.74 = 237,421.57/x
  3. Step 3: Cross multiply
    390,336.61x = 538,456.74 × 237,421.57
  4. Step 4: Simplify right side
    390,336.61x = 127,841,244,587.88
  5. Step 5: Solve for x
    x = 127,841,244,587.88/390,336.61
  6. Step 6: Final answer
    x = 327,515.38

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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.