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Finding the Fourth Proportional to 390,515.86, 538,924.62 and 216,088.03

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Solution

The fourth proportional to 390,515.86, 538,924.62 and 216,088.03 is: 298,208.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,515.86 : 538,924.62 = 216,088.03 : x
  2. Step 2: Convert to fraction form
    390,515.86/538,924.62 = 216,088.03/x
  3. Step 3: Cross multiply
    390,515.86x = 538,924.62 × 216,088.03
  4. Step 4: Simplify right side
    390,515.86x = 116,455,159,454.30
  5. Step 5: Solve for x
    x = 116,455,159,454.30/390,515.86
  6. Step 6: Final answer
    x = 298,208.53

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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.