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Finding the Fourth Proportional to 390,307.68, 538,617.60 and 220,538.16

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Solution

The fourth proportional to 390,307.68, 538,617.60 and 220,538.16 is: 304,338.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,307.68 : 538,617.60 = 220,538.16 : x
  2. Step 2: Convert to fraction form
    390,307.68/538,617.60 = 220,538.16/x
  3. Step 3: Cross multiply
    390,307.68x = 538,617.60 × 220,538.16
  4. Step 4: Simplify right side
    390,307.68x = 118,785,734,447.62
  5. Step 5: Solve for x
    x = 118,785,734,447.62/390,307.68
  6. Step 6: Final answer
    x = 304,338.71

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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.