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Finding the Fourth Proportional to 970.60, 1,338.96 and 621.04

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Solution

The fourth proportional to 970.60, 1,338.96 and 621.04 is: 856.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.60 : 1,338.96 = 621.04 : x
  2. Step 2: Convert to fraction form
    970.60/1,338.96 = 621.04/x
  3. Step 3: Cross multiply
    970.60x = 1,338.96 × 621.04
  4. Step 4: Simplify right side
    970.60x = 831,547.72
  5. Step 5: Solve for x
    x = 831,547.72/970.60
  6. Step 6: Final answer
    x = 856.74

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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.