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Finding the Fourth Proportional to 1,392,560.64, 1,921,730.40 and 788,948.64

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Solution

The fourth proportional to 1,392,560.64, 1,921,730.40 and 788,948.64 is: 1,088,747.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,560.64 : 1,921,730.40 = 788,948.64 : x
  2. Step 2: Convert to fraction form
    1,392,560.64/1,921,730.40 = 788,948.64/x
  3. Step 3: Cross multiply
    1,392,560.64x = 1,921,730.40 × 788,948.64
  4. Step 4: Simplify right side
    1,392,560.64x = 1,516,146,585,526.66
  5. Step 5: Solve for x
    x = 1,516,146,585,526.66/1,392,560.64
  6. Step 6: Final answer
    x = 1,088,747.26

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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.