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Finding the Fourth Proportional to 615,328.40, 921,437.40 and 490,912.40

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Solution

The fourth proportional to 615,328.40, 921,437.40 and 490,912.40 is: 735,127.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,328.40 : 921,437.40 = 490,912.40 : x
  2. Step 2: Convert to fraction form
    615,328.40/921,437.40 = 490,912.40/x
  3. Step 3: Cross multiply
    615,328.40x = 921,437.40 × 490,912.40
  4. Step 4: Simplify right side
    615,328.40x = 452,345,045,483.76
  5. Step 5: Solve for x
    x = 452,345,045,483.76/615,328.40
  6. Step 6: Final answer
    x = 735,127.85

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1.5x scale

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.