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Finding the Fourth Proportional to 390,482.88, 538,862.76 and 218,398.74

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Solution

The fourth proportional to 390,482.88, 538,862.76 and 218,398.74 is: 301,388.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,482.88 : 538,862.76 = 218,398.74 : x
  2. Step 2: Convert to fraction form
    390,482.88/538,862.76 = 218,398.74/x
  3. Step 3: Cross multiply
    390,482.88x = 538,862.76 × 218,398.74
  4. Step 4: Simplify right side
    390,482.88x = 117,686,947,816.92
  5. Step 5: Solve for x
    x = 117,686,947,816.92/390,482.88
  6. Step 6: Final answer
    x = 301,388.24

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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.