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Finding the Fourth Proportional to 390,560.34, 538,683.83 and 275,719.26

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Solution

The fourth proportional to 390,560.34, 538,683.83 and 275,719.26 is: 380,288.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,560.34 : 538,683.83 = 275,719.26 : x
  2. Step 2: Convert to fraction form
    390,560.34/538,683.83 = 275,719.26/x
  3. Step 3: Cross multiply
    390,560.34x = 538,683.83 × 275,719.26
  4. Step 4: Simplify right side
    390,560.34x = 148,525,506,981.57
  5. Step 5: Solve for x
    x = 148,525,506,981.57/390,560.34
  6. Step 6: Final answer
    x = 380,288.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.