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Finding the Fourth Proportional to 21,307.60, 29,411.40 and 14,235.60

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Solution

The fourth proportional to 21,307.60, 29,411.40 and 14,235.60 is: 19,649.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.60 : 29,411.40 = 14,235.60 : x
  2. Step 2: Convert to fraction form
    21,307.60/29,411.40 = 14,235.60/x
  3. Step 3: Cross multiply
    21,307.60x = 29,411.40 × 14,235.60
  4. Step 4: Simplify right side
    21,307.60x = 418,688,925.84
  5. Step 5: Solve for x
    x = 418,688,925.84/21,307.60
  6. Step 6: Final answer
    x = 19,649.75

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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.