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Finding the Fourth Proportional to 9,678.57, 13,356.57 and 5,430.57

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Solution

The fourth proportional to 9,678.57, 13,356.57 and 5,430.57 is: 7,494.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,678.57 : 13,356.57 = 5,430.57 : x
  2. Step 2: Convert to fraction form
    9,678.57/13,356.57 = 5,430.57/x
  3. Step 3: Cross multiply
    9,678.57x = 13,356.57 × 5,430.57
  4. Step 4: Simplify right side
    9,678.57x = 72,533,788.34
  5. Step 5: Solve for x
    x = 72,533,788.34/9,678.57
  6. Step 6: Final answer
    x = 7,494.27

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1.5x scale

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.