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Finding the Fourth Proportional to 390,047.70, 585,071.55 and 390,047.70

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Solution

The fourth proportional to 390,047.70, 585,071.55 and 390,047.70 is: 585,071.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,047.70 : 585,071.55 = 390,047.70 : x
  2. Step 2: Convert to fraction form
    390,047.70/585,071.55 = 390,047.70/x
  3. Step 3: Cross multiply
    390,047.70x = 585,071.55 × 390,047.70
  4. Step 4: Simplify right side
    390,047.70x = 228,205,812,412.94
  5. Step 5: Solve for x
    x = 228,205,812,412.94/390,047.70
  6. Step 6: Final answer
    x = 585,071.55

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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.