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Finding the Fourth Proportional to 390,750.27, 539,264.34 and 218,685.48

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Solution

The fourth proportional to 390,750.27, 539,264.34 and 218,685.48 is: 301,802.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,750.27 : 539,264.34 = 218,685.48 : x
  2. Step 2: Convert to fraction form
    390,750.27/539,264.34 = 218,685.48/x
  3. Step 3: Cross multiply
    390,750.27x = 539,264.34 × 218,685.48
  4. Step 4: Simplify right side
    390,750.27x = 117,929,281,039.78
  5. Step 5: Solve for x
    x = 117,929,281,039.78/390,750.27
  6. Step 6: Final answer
    x = 301,802.17

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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.