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Finding the Fourth Proportional to 652.48, 899.98 and 390.40

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Solution

The fourth proportional to 652.48, 899.98 and 390.40 is: 538.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.48 : 899.98 = 390.40 : x
  2. Step 2: Convert to fraction form
    652.48/899.98 = 390.40/x
  3. Step 3: Cross multiply
    652.48x = 899.98 × 390.40
  4. Step 4: Simplify right side
    652.48x = 351,352.19
  5. Step 5: Solve for x
    x = 351,352.19/652.48
  6. Step 6: Final answer
    x = 538.49

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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.