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Finding the Fourth Proportional to 615,557.60, 921,235.80 and 515,830.40

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Solution

The fourth proportional to 615,557.60, 921,235.80 and 515,830.40 is: 771,985.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,557.60 : 921,235.80 = 515,830.40 : x
  2. Step 2: Convert to fraction form
    615,557.60/921,235.80 = 515,830.40/x
  3. Step 3: Cross multiply
    615,557.60x = 921,235.80 × 515,830.40
  4. Step 4: Simplify right side
    615,557.60x = 475,201,431,208.32
  5. Step 5: Solve for x
    x = 475,201,431,208.32/615,557.60
  6. Step 6: Final answer
    x = 771,985.32

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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.