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Finding the Fourth Proportional to 390,156.81, 585,274.16 and 105,851.82

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Solution

The fourth proportional to 390,156.81, 585,274.16 and 105,851.82 is: 158,788.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,156.81 : 585,274.16 = 105,851.82 : x
  2. Step 2: Convert to fraction form
    390,156.81/585,274.16 = 105,851.82/x
  3. Step 3: Cross multiply
    390,156.81x = 585,274.16 × 105,851.82
  4. Step 4: Simplify right side
    390,156.81x = 61,952,334,505.71
  5. Step 5: Solve for x
    x = 61,952,334,505.71/390,156.81
  6. Step 6: Final answer
    x = 158,788.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.