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Finding the Fourth Proportional to 390.24, 538.53 and 215.58

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Solution

The fourth proportional to 390.24, 538.53 and 215.58 is: 297.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.24 : 538.53 = 215.58 : x
  2. Step 2: Convert to fraction form
    390.24/538.53 = 215.58/x
  3. Step 3: Cross multiply
    390.24x = 538.53 × 215.58
  4. Step 4: Simplify right side
    390.24x = 116,097.51
  5. Step 5: Solve for x
    x = 116,097.51/390.24
  6. Step 6: Final answer
    x = 297.50

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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.