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Finding the Fourth Proportional to 390,853.34, 538,640.45 and 313,240.83

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Solution

The fourth proportional to 390,853.34, 538,640.45 and 313,240.83 is: 431,681.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,853.34 : 538,640.45 = 313,240.83 : x
  2. Step 2: Convert to fraction form
    390,853.34/538,640.45 = 313,240.83/x
  3. Step 3: Cross multiply
    390,853.34x = 538,640.45 × 313,240.83
  4. Step 4: Simplify right side
    390,853.34x = 168,724,177,370.17
  5. Step 5: Solve for x
    x = 168,724,177,370.17/390,853.34
  6. Step 6: Final answer
    x = 431,681.55

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1.5x scale

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.