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Finding the Fourth Proportional to 390,061.17, 538,274.01 and 217,980.48

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Solution

The fourth proportional to 390,061.17, 538,274.01 and 217,980.48 is: 300,807.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,061.17 : 538,274.01 = 217,980.48 : x
  2. Step 2: Convert to fraction form
    390,061.17/538,274.01 = 217,980.48/x
  3. Step 3: Cross multiply
    390,061.17x = 538,274.01 × 217,980.48
  4. Step 4: Simplify right side
    390,061.17x = 117,333,227,071.33
  5. Step 5: Solve for x
    x = 117,333,227,071.33/390,061.17
  6. Step 6: Final answer
    x = 300,807.25

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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.