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Finding the Fourth Proportional to 560.79, 840.70 and 438.68

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Solution

The fourth proportional to 560.79, 840.70 and 438.68 is: 657.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.79 : 840.70 = 438.68 : x
  2. Step 2: Convert to fraction form
    560.79/840.70 = 438.68/x
  3. Step 3: Cross multiply
    560.79x = 840.70 × 438.68
  4. Step 4: Simplify right side
    560.79x = 368,798.28
  5. Step 5: Solve for x
    x = 368,798.28/560.79
  6. Step 6: Final answer
    x = 657.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.