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Finding the Fourth Proportional to 448.75, 619.14 and 390.43

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Solution

The fourth proportional to 448.75, 619.14 and 390.43 is: 538.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.75 : 619.14 = 390.43 : x
  2. Step 2: Convert to fraction form
    448.75/619.14 = 390.43/x
  3. Step 3: Cross multiply
    448.75x = 619.14 × 390.43
  4. Step 4: Simplify right side
    448.75x = 241,730.83
  5. Step 5: Solve for x
    x = 241,730.83/448.75
  6. Step 6: Final answer
    x = 538.68

Related Problems

Find fourth proportional to 224.38, 309.57 and 195.22
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Double scale
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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.