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Finding the Fourth Proportional to 560.79, 840.64 and 287.01

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Solution

The fourth proportional to 560.79, 840.64 and 287.01 is: 430.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.79 : 840.64 = 287.01 : x
  2. Step 2: Convert to fraction form
    560.79/840.64 = 287.01/x
  3. Step 3: Cross multiply
    560.79x = 840.64 × 287.01
  4. Step 4: Simplify right side
    560.79x = 241,272.09
  5. Step 5: Solve for x
    x = 241,272.09/560.79
  6. Step 6: Final answer
    x = 430.24

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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.