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Finding the Fourth Proportional to 1,319,217.40, 1,978,826.10 and 899,313.40

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Solution

The fourth proportional to 1,319,217.40, 1,978,826.10 and 899,313.40 is: 1,348,970.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,217.40 : 1,978,826.10 = 899,313.40 : x
  2. Step 2: Convert to fraction form
    1,319,217.40/1,978,826.10 = 899,313.40/x
  3. Step 3: Cross multiply
    1,319,217.40x = 1,978,826.10 × 899,313.40
  4. Step 4: Simplify right side
    1,319,217.40x = 1,779,584,827,999.74
  5. Step 5: Solve for x
    x = 1,779,584,827,999.74/1,319,217.40
  6. Step 6: Final answer
    x = 1,348,970.10

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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.