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Finding the Fourth Proportional to 5,312, 7,969.28 and 1,664

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Solution

The fourth proportional to 5,312, 7,969.28 and 1,664 is: 2,496.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,312 : 7,969.28 = 1,664 : x
  2. Step 2: Convert to fraction form
    5,312/7,969.28 = 1,664/x
  3. Step 3: Cross multiply
    5,312x = 7,969.28 × 1,664
  4. Step 4: Simplify right side
    5,312x = 13,260,881.92
  5. Step 5: Solve for x
    x = 13,260,881.92/5,312
  6. Step 6: Final answer
    x = 2,496.40

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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.