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Finding the Fourth Proportional to 390,856.77, 538,645.19 and 313,244.26

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Solution

The fourth proportional to 390,856.77, 538,645.19 and 313,244.26 is: 431,686.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,856.77 : 538,645.19 = 313,244.26 : x
  2. Step 2: Convert to fraction form
    390,856.77/538,645.19 = 313,244.26/x
  3. Step 3: Cross multiply
    390,856.77x = 538,645.19 × 313,244.26
  4. Step 4: Simplify right side
    390,856.77x = 168,727,509,684.66
  5. Step 5: Solve for x
    x = 168,727,509,684.66/390,856.77
  6. Step 6: Final answer
    x = 431,686.29

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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.