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Finding the Fourth Proportional to 390,913.40, 586,370.10 and 124,693.40

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Solution

The fourth proportional to 390,913.40, 586,370.10 and 124,693.40 is: 187,040.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,913.40 : 586,370.10 = 124,693.40 : x
  2. Step 2: Convert to fraction form
    390,913.40/586,370.10 = 124,693.40/x
  3. Step 3: Cross multiply
    390,913.40x = 586,370.10 × 124,693.40
  4. Step 4: Simplify right side
    390,913.40x = 73,116,481,427.34
  5. Step 5: Solve for x
    x = 73,116,481,427.34/390,913.40
  6. Step 6: Final answer
    x = 187,040.10

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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.