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Finding the Fourth Proportional to 390,554.67, 538,940.03 and 218,442.81

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Solution

The fourth proportional to 390,554.67, 538,940.03 and 218,442.81 is: 301,436.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,554.67 : 538,940.03 = 218,442.81 : x
  2. Step 2: Convert to fraction form
    390,554.67/538,940.03 = 218,442.81/x
  3. Step 3: Cross multiply
    390,554.67x = 538,940.03 × 218,442.81
  4. Step 4: Simplify right side
    390,554.67x = 117,727,573,482.47
  5. Step 5: Solve for x
    x = 117,727,573,482.47/390,554.67
  6. Step 6: Final answer
    x = 301,436.86

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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.