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Finding the Fourth Proportional to 390,070.30, 547,279.40 and 390,070.30

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Solution

The fourth proportional to 390,070.30, 547,279.40 and 390,070.30 is: 547,279.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,070.30 : 547,279.40 = 390,070.30 : x
  2. Step 2: Convert to fraction form
    390,070.30/547,279.40 = 390,070.30/x
  3. Step 3: Cross multiply
    390,070.30x = 547,279.40 × 390,070.30
  4. Step 4: Simplify right side
    390,070.30x = 213,477,439,741.82
  5. Step 5: Solve for x
    x = 213,477,439,741.82/390,070.30
  6. Step 6: Final answer
    x = 547,279.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.