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Finding the Fourth Proportional to 390,063.39, 585,115.13 and 109,602.51

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Solution

The fourth proportional to 390,063.39, 585,115.13 and 109,602.51 is: 164,409.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,063.39 : 585,115.13 = 109,602.51 : x
  2. Step 2: Convert to fraction form
    390,063.39/585,115.13 = 109,602.51/x
  3. Step 3: Cross multiply
    390,063.39x = 585,115.13 × 109,602.51
  4. Step 4: Simplify right side
    390,063.39x = 64,130,086,886.98
  5. Step 5: Solve for x
    x = 64,130,086,886.98/390,063.39
  6. Step 6: Final answer
    x = 164,409.40

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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.