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Finding the Fourth Proportional to 390,880.56, 585,667.76 and 376,319.28

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Solution

The fourth proportional to 390,880.56, 585,667.76 and 376,319.28 is: 563,850.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,880.56 : 585,667.76 = 376,319.28 : x
  2. Step 2: Convert to fraction form
    390,880.56/585,667.76 = 376,319.28/x
  3. Step 3: Cross multiply
    390,880.56x = 585,667.76 × 376,319.28
  4. Step 4: Simplify right side
    390,880.56x = 220,398,069,762.41
  5. Step 5: Solve for x
    x = 220,398,069,762.41/390,880.56
  6. Step 6: Final answer
    x = 563,850.17

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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.