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Finding the Fourth Proportional to 948.40, 1,307.44 and 653.20

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Solution

The fourth proportional to 948.40, 1,307.44 and 653.20 is: 900.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.40 : 1,307.44 = 653.20 : x
  2. Step 2: Convert to fraction form
    948.40/1,307.44 = 653.20/x
  3. Step 3: Cross multiply
    948.40x = 1,307.44 × 653.20
  4. Step 4: Simplify right side
    948.40x = 854,019.81
  5. Step 5: Solve for x
    x = 854,019.81/948.40
  6. Step 6: Final answer
    x = 900.48

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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.