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Finding the Fourth Proportional to 659,638.40, 989,025.60 and 260,038.40

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Solution

The fourth proportional to 659,638.40, 989,025.60 and 260,038.40 is: 389,887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,638.40 : 989,025.60 = 260,038.40 : x
  2. Step 2: Convert to fraction form
    659,638.40/989,025.60 = 260,038.40/x
  3. Step 3: Cross multiply
    659,638.40x = 989,025.60 × 260,038.40
  4. Step 4: Simplify right side
    659,638.40x = 257,184,634,583.04
  5. Step 5: Solve for x
    x = 257,184,634,583.04/659,638.40
  6. Step 6: Final answer
    x = 389,887.30

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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.