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Finding the Fourth Proportional to 437.48, 604.08 and 390.77

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Solution

The fourth proportional to 437.48, 604.08 and 390.77 is: 539.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.48 : 604.08 = 390.77 : x
  2. Step 2: Convert to fraction form
    437.48/604.08 = 390.77/x
  3. Step 3: Cross multiply
    437.48x = 604.08 × 390.77
  4. Step 4: Simplify right side
    437.48x = 236,053.32
  5. Step 5: Solve for x
    x = 236,053.32/437.48
  6. Step 6: Final answer
    x = 539.58

Related Problems

Find fourth proportional to 218.74, 302.04 and 195.38
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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.