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Finding the Fourth Proportional to 390,330.37, 538,804.55 and 254,397.38

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Solution

The fourth proportional to 390,330.37, 538,804.55 and 254,397.38 is: 351,165.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,330.37 : 538,804.55 = 254,397.38 : x
  2. Step 2: Convert to fraction form
    390,330.37/538,804.55 = 254,397.38/x
  3. Step 3: Cross multiply
    390,330.37x = 538,804.55 × 254,397.38
  4. Step 4: Simplify right side
    390,330.37x = 137,070,464,580.09
  5. Step 5: Solve for x
    x = 137,070,464,580.09/390,330.37
  6. Step 6: Final answer
    x = 351,165.26

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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.