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Finding the Fourth Proportional to 620,011.48, 856,019.14 and 378,434.12

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Solution

The fourth proportional to 620,011.48, 856,019.14 and 378,434.12 is: 522,485.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,011.48 : 856,019.14 = 378,434.12 : x
  2. Step 2: Convert to fraction form
    620,011.48/856,019.14 = 378,434.12/x
  3. Step 3: Cross multiply
    620,011.48x = 856,019.14 × 378,434.12
  4. Step 4: Simplify right side
    620,011.48x = 323,946,849,949.06
  5. Step 5: Solve for x
    x = 323,946,849,949.06/620,011.48
  6. Step 6: Final answer
    x = 522,485.24

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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.