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Finding the Fourth Proportional to 840.86, 1,157.55 and 693.26

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Solution

The fourth proportional to 840.86, 1,157.55 and 693.26 is: 954.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.86 : 1,157.55 = 693.26 : x
  2. Step 2: Convert to fraction form
    840.86/1,157.55 = 693.26/x
  3. Step 3: Cross multiply
    840.86x = 1,157.55 × 693.26
  4. Step 4: Simplify right side
    840.86x = 802,483.11
  5. Step 5: Solve for x
    x = 802,483.11/840.86
  6. Step 6: Final answer
    x = 954.36

Related Problems

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Half scale
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Double scale
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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.