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Finding the Fourth Proportional to 390,000.86, 585,088.79 and 130,357.96

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Solution

The fourth proportional to 390,000.86, 585,088.79 and 130,357.96 is: 195,566.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,000.86 : 585,088.79 = 130,357.96 : x
  2. Step 2: Convert to fraction form
    390,000.86/585,088.79 = 130,357.96/x
  3. Step 3: Cross multiply
    390,000.86x = 585,088.79 × 130,357.96
  4. Step 4: Simplify right side
    390,000.86x = 76,270,978,968.76
  5. Step 5: Solve for x
    x = 76,270,978,968.76/390,000.86
  6. Step 6: Final answer
    x = 195,566.18

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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.