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Finding the Fourth Proportional to 840.56, 1,258.28 and 623.60

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Solution

The fourth proportional to 840.56, 1,258.28 and 623.60 is: 933.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.56 : 1,258.28 = 623.60 : x
  2. Step 2: Convert to fraction form
    840.56/1,258.28 = 623.60/x
  3. Step 3: Cross multiply
    840.56x = 1,258.28 × 623.60
  4. Step 4: Simplify right side
    840.56x = 784,663.41
  5. Step 5: Solve for x
    x = 784,663.41/840.56
  6. Step 6: Final answer
    x = 933.50

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Double scale
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1.5x scale

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.