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Finding the Fourth Proportional to 440.19, 607.43 and 243.72

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Solution

The fourth proportional to 440.19, 607.43 and 243.72 is: 336.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.19 : 607.43 = 243.72 : x
  2. Step 2: Convert to fraction form
    440.19/607.43 = 243.72/x
  3. Step 3: Cross multiply
    440.19x = 607.43 × 243.72
  4. Step 4: Simplify right side
    440.19x = 148,043.45
  5. Step 5: Solve for x
    x = 148,043.45/440.19
  6. Step 6: Final answer
    x = 336.32

Related Problems

Find fourth proportional to 220.10, 303.72 and 121.86
Half scale
Find fourth proportional to 880.38, 1,214.87 and 487.44
Double scale
Find fourth proportional to 441.19, 608.81 and 244.72
Similar ratio
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1.5x scale

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.